How to keep the junk e-mail away

Spam - the bane of all internet users everywhere.
Every day your e-mail box fills up with junk mail, some of it very offensive.
Here is a collection of quite a bit of information on dealing with spam.
Some of it is easy to follow, and some gets into the
technical details of tracing and reporting spammers.
Note that this site deals with truly unsolicited e-mailings.